Four-yearly Wage Structure Survey 
Sampling errors
Studies completed. National total
Units: %

All studies	0.37	
I. Without studies	3.90	
II. Primary education	1.43	
III. Secondary education I	0.90	
IV. Secondary education II	1.35	
V. Intermediate-level vocational training	1.39	
VI. Advanced vocational training	1.32	
VII. University diploma-holders or the equivalent	1.39	
VIII. University graduates, advanced engineers and doctors	1.37	
Notes:
Source: National Statistics Institute